Mon Nov 30 04:09:10 UTC 2009 pix@kepibu.org

* Add :nth-child selector

--- old-Oh, Ducks!/notes 2015-10-10 15:29:33.000000000 +0000

+++ new-Oh, Ducks!/notes 2015-10-10 15:29:34.000000000 +0000

@@ -115,9 +115,9 @@

* [ ] selectors involving descendants

** write documentation

** improve selector support

-*** positional selectors [2/12]

+*** positional selectors [3/12]

* [X] :nth-child(n)

- * [ ] :nth-child(xn+y)

+ * [X] :nth-child(xn+y)

* [ ] :nth-last-child

* [X] :first-child

* [ ] :last-child

--- old-Oh, Ducks!/selectors.lisp 2015-10-10 15:29:33.000000000 +0000

+++ new-Oh, Ducks!/selectors.lisp 2015-10-10 15:29:34.000000000 +0000

@@ -34,6 +34,7 @@

(defclass id-selector (simple-selector) ())

(defclass class-selector (simple-selector) ())

(defclass nth-child-selector (simple-selector) ())

+(defclass nth-last-child-selector (nth-child-selector) ())

(defmethod print-object ((selector universal-selector) stream)

(format stream "#<universal-selector>"))

@@ -53,10 +54,25 @@

(#T(regexp$ "[ ]+" ())

(list (make-instance 'descendant-combinator :matcher (parse-selector &rest))))

;; simple selectors

- (#T(regexp$ ":nth-child\\([ ]*([0-9]+)[ ]*\\)" (?n))

- (cons (make-instance 'nth-child-selector :arg (parse-integer n)) (parse-selector &rest)))

+ ;; FIXME: fix cl-unification so it can handle non-matching groups,

+ ;; so we can merge all these nth-child-selector variants

+ ;; into one or two

+ (#T(regexp$ ":nth-child\\([ ]*([+-]?[0-9]+)n[ ]*([+-]?[0-9]+)[ ]*\\)" (?a ?b))

+ (cons (make-instance 'nth-child-selector :arg (cons (parse-integer a) (parse-integer b))) (parse-selector &rest)))

+ (#T(regexp$ ":nth-child\\([ ]*([+-]?[0-9]+)n[ ]*\\)" (?a))

+ (cons (make-instance 'nth-child-selector :arg (cons (parse-integer a) 0)) (parse-selector &rest)))

+ (#T(regexp$ ":nth-child\\([ ]*n[ ]*([+-]?[0-9]+)[ ]*\\)" (?b))

+ (cons (make-instance 'nth-child-selector :arg (cons 1 (parse-integer b))) (parse-selector &rest)))

+ (#T(regexp$ ":nth-child\\([ ]*-n[ ]*([+-]?[0-9]+)[ ]*\\)" (?b))

+ (cons (make-instance 'nth-child-selector :arg (cons -1 (parse-integer b))) (parse-selector &rest)))

+ (#T(regexp$ ":nth-child\\([ ]*([+-]?[0-9]+)[ ]*\\)" (?b))

+ (cons (make-instance 'nth-child-selector :arg (cons 0 (parse-integer b))) (parse-selector &rest)))

+ (#T(regexp$ ":nth-child\\([ ]*odd[ ]*\\)" ())

+ (cons (make-instance 'nth-child-selector :arg (cons 2 1)) (parse-selector &rest)))

+ (#T(regexp$ ":nth-child\\([ ]*even[ ]*\\)" ())

+ (cons (make-instance 'nth-child-selector :arg (cons 2 0)) (parse-selector &rest)))

(#T(regexp$ ":first-child" ())

- (cons (make-instance 'nth-child-selector :arg 1) (parse-selector &rest)))

+ (cons (make-instance 'nth-child-selector :arg (cons 0 1)) (parse-selector &rest)))

(#T(regexp$ "[#](\\w+)" (?id))

(cons (make-instance 'id-selector :arg id) (parse-selector &rest)))

(#T(regexp$ "[\\.](\\w+)" (?class))

@@ -88,8 +104,20 @@

(defmethod element-matches-p (element (selector nth-child-selector))

(when-let* ((parent (element-parent element))

- (pos (position element (element-children parent) :test #'eq)))

- (= (selector-arg selector) (1+ pos))))

+ (pos (position element (funcall (typecase selector

+ (nth-last-child-selector #'reverse)

+ (nth-child-selector #'identity))

+ (element-children parent)) :test #'eq)))

+ (let ((pos (1+ pos))

+ (a (car (selector-arg selector)))

+ (b (cdr (selector-arg selector))))

+ ;; pos = An + B

+ (cond

+ ;; pos = 0n + B

+ ((= 0 a) (= b pos))

+ ;; (pos - B)/A = n

+ (t (and (zerop (mod (- pos b) a))

+ (not (minusp (/ (- pos b) a)))))))))

(defmethod element-matches-p (element (selector class-selector))

(member (selector-arg selector)